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首页> 外文会议>International symposium on photoelectronic detection and imaging;ISPDI 2011 >Calibration of an AOTF hyperspectral imager with configurable spectral selectivity
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Calibration of an AOTF hyperspectral imager with configurable spectral selectivity

机译：可配置光谱选择性的AOTF高光谱成像仪校准

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The hyperspectral imager is a kind of camera that can image objects in many narrow spectral bands, and acousto-optic tunable filters (AOTFs) can be used as the optical filtering elements in such instruments. AOTFs have many advantages such as solid-state, small size, good environmental adaptability, programmable, electronically control and so on, which are suitable for space exploration. For instance, AOTFs have been used in Mars and Venus detection. However, more advantages of AOTFs can be utilized in spectral detection, such as random wavelength access and configurable spectral resolution, and more flexible imagers can be expected with these characteristics. As a result, a new hyperspectral imager based on AOTF has been realized. It can not only take images in the spectral range of 460-1 100nm with more than one hundred narrow bands, but also allow users to select any set of bands and configure the spectral resolution in a certain range just by computer commands. To do so, a multi-channel RF generation system is developed to drive the AOTF. When multi RF frequencies are applied to the AOTF simultaneously, not only the central wavelength, but also the bandwidth and the passband shape of the selected band, can be controlled by configuring the RF signals. Such capability enhances the flexibility of hyperspectral imaging, but the increased number of configurable variables complicates the course of calibration, so some specific calibration setups and methods are needed. In this paper, the laboratory calibration of the imager is introduced, and some results are presented and analyzed.
机译：高光谱成像仪是一种可以对许多窄光谱带中的物体成像的相机，并且声光可调滤光片（AOTF）可以用作此类仪器中的光学滤光片。 AOTF具有许多优点，例如固态，小尺寸，良好的环境适应性，可编程的，电子控制的等，适合太空探索。例如，AOTF已用于火星和金星探测。但是，AOTF的更多优势可以用于光谱检测，例如随机波长访问和可配置的光谱分辨率，并且具有这些特性的成像器也可以期待。结果，已经实现了基于AOTF的新型高光谱成像仪。它不仅可以在460-1 100nm的光谱范围内拍摄一百多个窄带的图像，而且还允许用户仅通过计算机命令就可以选择任意一组波段并在特定范围内配置光谱分辨率。为此，开发了一种多通道RF生成系统来驱动AOTF。当多个RF频率同时应用于AOTF时，通过配置RF信号，不仅可以控制中心波长，而且可以控制所选频带的带宽和通带形状。这种功能增强了高光谱成像的灵活性，但是可配置变量数量的增加使校准过程复杂化，因此需要一些特定的校准设置和方法。本文介绍了成像仪的实验室校准，并给出了一些结果并进行了分析。

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